Universal GPS Speedometer 4.5" G1 Speed Odometer Mileage HUD Display Digital Speed Alarm MPH KMH Altitude Display Projector Tips: For all models, the connection is a USB interface,easy to install, plug and play. Auto- sensitivity mode Equipped with photosensitive elements, the brightness of the displayis automatically adjusted according to the intensity of external light, so that it is clearly visible under strong light. Two color machine G1 Main Functions: GPS speedometer: collecting real time speed from GPS satellitesDriving time and distance calculation and display Plug & play: Power through vehicle cigarette outlet jack, no professional installation is required Display MPH or KM/h - Simple push button set up Auto adjust brightness through sensor for day & night-time driving Over-speed warning: 3-second alarm beep and display flash will warn driver 93 beeps for over speeding alert) Alarm mute function Universal: compatible with all cars, trucks, bikes, & motorcycles.note:whenusingwiththebicycle,plsusetheusbcableconnectingwithapowerbank. USB power supply 0 power consumptionUsing car USB (5V) or digarette lighter to USB power supply, really zero powerconsumption. USB or digarette lighter is a short power, the car is turned off and thepower is cut off, there is no the phenomenon of power stealing,and OBD is a long power. Accessories:Power from the cigarettelighter interface:Connect the cigarettelighter plug to the cigarette lighter interface,and use the USB cable to connect the cigarette lighter.